Add information how to add a sequence as default value (#2726)

* Add information how to add a sequence as default value

Add information how to add a sequence as default value (#2726)
* Add information how to add a sequence as default value
1908f840 · Andreas Scherbaum · Andreas Scherbaum · 32c8b291 · 1908f840
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gpdb-doc/dita/admin_guide/ddl/ddl-sequence.xml gpdb-doc/dita/admin_guide/ddl/ddl-sequence.xml +16 -0

未找到文件。
--- a/gpdb-doc/dita/admin_guide/ddl/ddl-sequence.xml
+++ b/gpdb-doc/dita/admin_guide/ddl/ddl-sequence.xml
@@ -76,4 +76,20 @@
      </p>
    </body>
  </topic>
+  <topic id="topic91" xml:lang="en">
+    <title>Making a Sequence the Default Value for a Column</title>
+    <body>
+      <p>A sequence can be used in the <codeph>CREATE TABLE</codeph> command (instead of the
+          <codeph>SERIAL</codeph> or <codeph>BIGSERIAL</codeph> type):</p>
+      <p>
+        <codeblock>CREATE TABLE ... (
+            id INT4 DEFAULT nextval('id_seq')
+            );
+</codeblock>
+      </p>
+      <p>Alternatively, a column can be altered and a sequence can be added as default value:</p>
+        <codeblock>ALTER TABLE ... ALTER COLUMN id SET DEFAULT nextval('id_seq');
+</codeblock>
+    </body>
+  </topic>
 </topic>